Process DROP_SET event to drop replication of set set_id. This involves:
- Removing log and deny access triggers
- Removing all traces of the set configuration, including sequences, tables, subscribers, syncs, and the set itself

declare
v_origin int4;
begin
-- ----
-- Check that the set exists and originates here
-- ----
select set_origin into v_origin from sl_set
where set_id = p_set_id;
if not found then
raise exception 'Slony-I: set % not found', p_set_id;
end if;
if v_origin != getLocalNodeId('_schemadoc') then
raise exception 'Slony-I: set % does not originate on local node',
p_set_id;
end if;
-- ----
-- Call the internal drop set functionality and generate the event
-- ----
perform dropSet_int(p_set_id);
return createEvent('_schemadoc', 'DROP_SET',
p_set_id::text);
end;